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Summit SI-90

Summit SI-90
Image: wass.net used with permission

The Summit SI-90 is a scientific calculator with 10 digits precision and algebraic logic. It has 20 functions, 36 keys, and an LED (light-emitting diode) display, typical of calculators of this era. The power source is Sealed battery pack.

Facts at a glance:

FeatureValue
TypeScientific
Functions20
Keys36
Precision10
LogicAlgebraic
Display typeLED
Length203mm
Width83mm
Thickness38mm
Power SourceSealed battery pack
Year introduced1974
Year discontinued1974

Replacements:

If you have a Summit SI-90 that is no longer working, you can consider replacing the calculator with a modern equivalent. We suggest the following current model as a replacement:

See other calculators by Summit